package com.base.pub.persistence;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang3.StringUtils;

import com.base.pub.util.CookieUtils;
import com.fasterxml.jackson.annotation.JsonIgnore;

public class MybatisPageFrag<T> implements Serializable {

	private static final long	serialVersionUID	= -5715938954382731729L;
	private int					pageNo				= 1;						// 当前页码
	private int					pageSize			= -1;						// 页面大小，设置为“-1”表示不进行分页（分页无效）

	private long				count;											// 总记录数，设置为“-1”表示不查询总数

	private int					first;											// 首页索引
	private int					last;											// 尾页索引
	private int					prev;											// 上一页索引
	private int					next;											// 下一页索引

	private boolean				firstPage;										// 是否是第一页
	private boolean				lastPage;										// 是否是最后一页

	private int					length				= 8;						// 显示页面长度
	private int					slider				= 1;						// 前后显示页面长度

	private List<T>				list				= new ArrayList<T>();

	private String				orderBy				= "";						// 标准查询有效，
																				// 实例：
																				// updatedate
																				// desc,
																				// name
																				// asc

	private String				funcName			= "page";					// 设置点击页码调用的js函数名称，默认为page，在一页有多个分页对象时使用。

	private String				funcParam			= "";						// 函数的附加参数，第三个参数值。

	private String				message				= "";						// 设置提示消息，显示在“共n条”之后

	public MybatisPageFrag() {
		this.pageSize = -1;
	}

	public MybatisPageFrag(HttpServletRequest request, HttpServletResponse response) {
		this(request, response, -2);
	}

	public MybatisPageFrag(HttpServletRequest request, HttpServletResponse response, int defaultPageSize) {
		// 设置页码参数（传递repage参数，来记住页码）
		String no = request.getParameter("pageNo");
		if (StringUtils.isNumeric(no)) {
			CookieUtils.setCookie(response, "pageNo", no);
			this.setPageNo(Integer.parseInt(no));
		} else if (request.getParameter("repage") != null) {
			no = CookieUtils.getCookie(request, "pageNo");
			if (StringUtils.isNumeric(no)) {
				this.setPageNo(Integer.parseInt(no));
			}
		}
		// 设置页面大小参数（传递repage参数，来记住页码大小）
		String size = request.getParameter("pageSize");
		if (StringUtils.isNumeric(size)) {
			CookieUtils.setCookie(response, "pageSize", size);
			this.setPageSize(Integer.parseInt(size));
		} else if (request.getParameter("repage") != null) {
			no = CookieUtils.getCookie(request, "pageSize");
			if (StringUtils.isNumeric(size)) {
				this.setPageSize(Integer.parseInt(size));
			}
		} else if (defaultPageSize != -2) {
			this.pageSize = defaultPageSize;
		}
		// 设置排序参数
		String orderBy = request.getParameter("orderBy");
		if (StringUtils.isNotBlank(orderBy)) {
			this.setOrderBy(orderBy);
		}
	}

	public MybatisPageFrag(int pageNo, int pageSize) {
		this(pageNo, pageSize, 0);
	}

	public MybatisPageFrag(int pageNo, int pageSize, long count) {
		this(pageNo, pageSize, count, new ArrayList<T>());
	}

	public MybatisPageFrag(int pageNo, int pageSize, long count, List<T> list) {
		this.setCount(count);
		this.setPageNo(pageNo);
		this.pageSize = pageSize;
		this.list = list;
	}

	public String getHtml() {
		return getString();
	}

	/**
	 * 获取设置总数
	 * 
	 * @return
	 */
	public long getCount() {
		return count;
	}

	/**
	 * 设置数据总数
	 * 
	 * @param count
	 */
	public void setCount(long count) {
		this.count = count;
		if (pageSize >= count) {
			pageNo = 1;
		}
	}

	/**
	 * 获取当前页码
	 * 
	 * @return
	 */
	public int getPageNo() {
		return pageNo;
	}

	/**
	 * 设置当前页码
	 * 
	 * @param pageNo
	 */
	public void setPageNo(int pageNo) {
		this.pageNo = pageNo;
	}

	/**
	 * 获取页面大小
	 * 
	 * @return
	 */
	public int getPageSize() {
		return pageSize;
	}

	/**
	 * 设置页面大小（最大500）
	 * 
	 * @param pageSize
	 */
	public void setPageSize(int pageSize) {
		this.pageSize = pageSize <= 0 ? 10 : pageSize;// > 500 ? 500 : pageSize;
	}

	/**
	 * 首页索引
	 * 
	 * @return
	 */
	@JsonIgnore
	public int getFirst() {
		return first;
	}

	/**
	 * 尾页索引
	 * 
	 * @return
	 */
	@JsonIgnore
	public int getLast() {
		return last;
	}

	/**
	 * 获取页面总数
	 * 
	 * @return getLast();
	 */
	@JsonIgnore
	public int getTotalPage() {
		return getLast();
	}

	/**
	 * 是否为第一页
	 * 
	 * @return
	 */
	@JsonIgnore
	public boolean isFirstPage() {
		return firstPage;
	}

	/**
	 * 是否为最后一页
	 * 
	 * @return
	 */
	@JsonIgnore
	public boolean isLastPage() {
		return lastPage;
	}

	/**
	 * 上一页索引值
	 * 
	 * @return
	 */
	@JsonIgnore
	public int getPrev() {
		if (isFirstPage()) {
			return pageNo;
		} else {
			return pageNo - 1;
		}
	}

	/**
	 * 下一页索引值
	 * 
	 * @return
	 */
	@JsonIgnore
	public int getNext() {
		if (isLastPage()) {
			return pageNo;
		} else {
			return pageNo + 1;
		}
	}

	/**
	 * 获取本页数据对象列表
	 * 
	 * @return List<T>
	 */
	public List<T> getList() {
		return list;
	}

	/**
	 * 设置本页数据对象列表
	 * 
	 * @param list
	 */
	public MybatisPageFrag<T> setList(List<T> list) {
		this.list = list;
		initialize();
		return this;
	}

	@JsonIgnore
	public String getOrderBy() {
		String reg = "(?:')|(?:--)|(/\\*(?:.|[\\n\\r])*?\\*/)|"
				+ "(\\b(select|update|and|or|delete|insert|trancate|char|into|substr|ascii|declare|exec|count|master|into|drop|execute)\\b)";
		Pattern sqlPattern = Pattern.compile(reg, Pattern.CASE_INSENSITIVE);
		if (sqlPattern.matcher(orderBy).find()) {
			return "";
		}
		return orderBy;
	}

	/**
	 * 设置查询排序，标准查询有效， 实例： updatedate desc, name asc
	 */
	public void setOrderBy(String orderBy) {
		this.orderBy = orderBy;
	}

	/**
	 * 获取点击页码调用的js函数名称 function ${page.funcName}(pageNo){location=
	 * "${ctx}/list-${category.id}${urlSuffix}?pageNo="+i;}
	 * 
	 * @return
	 */
	@JsonIgnore
	public String getFuncName() {
		return funcName;
	}

	/**
	 * 设置点击页码调用的js函数名称，默认为page，在一页有多个分页对象时使用。
	 * 
	 * @param funcName
	 *            默认为page
	 */
	public void setFuncName(String funcName) {
		this.funcName = funcName;
	}

	/**
	 * 获取分页函数的附加参数
	 * 
	 * @return
	 */
	@JsonIgnore
	public String getFuncParam() {
		return funcParam;
	}

	/**
	 * 设置分页函数的附加参数
	 * 
	 * @return
	 */
	public void setFuncParam(String funcParam) {
		this.funcParam = funcParam;
	}

	/**
	 * 设置提示消息，显示在“共n条”之后
	 * 
	 * @param message
	 */
	public void setMessage(String message) {
		this.message = message;
	}

	/**
	 * 分页是否有效
	 * 
	 * @return this.pageSize==-1
	 */
	@JsonIgnore
	public boolean isDisabled() {
		return this.pageSize == -1;
	}

	/**
	 * 是否进行总数统计
	 * 
	 * @return this.count==-1
	 */
	@JsonIgnore
	public boolean isNotCount() {
		return this.count == -1;
	}

	/**
	 * 获取 Hibernate FirstResult
	 */
	public int getFirstResult() {
		int firstResult = (getPageNo() - 1) * getPageSize();
		if (firstResult >= getCount()) {
			firstResult = 0;
		}
		return firstResult;
	}

	/**
	 * 获取 Hibernate MaxResults
	 */
	public int getMaxResults() {
		return getPageSize();
	}

	private void initialize() {

		// 1
		this.first = 1;

		this.last = (int) (count / (this.pageSize < 1 ? 20 : this.pageSize) + first - 1);

		if (this.count % this.pageSize != 0 || this.last == 0) {
			this.last++;
		}

		if (this.last < this.first) {
			this.last = this.first;
		}

		if (this.pageNo <= 1) {
			this.pageNo = this.first;
			this.firstPage = true;
		}

		if (this.pageNo >= this.last) {
			this.pageNo = this.last;
			this.lastPage = true;
		}

		if (this.pageNo < this.last - 1) {
			this.next = this.pageNo + 1;
		} else {
			this.next = this.last;
		}

		if (this.pageNo > 1) {
			this.prev = this.pageNo - 1;
		} else {
			this.prev = this.first;
		}

		// 2
		if (this.pageNo < this.first) {// 如果当前页小于首页
			this.pageNo = this.first;
		}

		if (this.pageNo > this.last) {// 如果当前页大于尾页
			this.pageNo = this.last;
		}

	}

	@Override
	public String toString() {
		return getString();
	}

	private String getString() {

		StringBuilder sb = new StringBuilder();

		if (pageNo == first) {// 如果是首页
			sb.append("<li class=\"disabled\"><a href=\"javascript:\">&#171; 上一页</a></li>\n");
		} else {
			sb.append("<li><a href=\"javascript:\" onclick=\"" + funcName + "(" + prev + "," + pageSize + ",'" + funcParam
					+ "');\">&#171; 上一页</a></li>\n");
		}

		int begin = pageNo - (length / 2);

		if (begin < first) {
			begin = first;
		}

		int end = begin + length - 1;

		if (end >= last) {
			end = last;
			begin = end - length + 1;
			if (begin < first) {
				begin = first;
			}
		}

		if (begin > first) {
			int i = 0;
			for (i = first; i < first + slider && i < begin; i++) {
				sb.append("<li><a href=\"javascript:\" onclick=\"" + funcName + "(" + i + "," + pageSize + ",'" + funcParam + "');\">"
						+ (i + 1 - first) + "</a></li>\n");
			}
			if (i < begin) {
				sb.append("<li class=\"disabled\"><a href=\"javascript:\">...</a></li>\n");
			}
		}

		for (int i = begin; i <= end; i++) {
			if (i == pageNo) {
				sb.append("<li class=\"active\"><a href=\"javascript:\">" + (i + 1 - first) + "</a></li>\n");
			} else {
				sb.append("<li><a href=\"javascript:\" onclick=\"" + funcName + "(" + i + "," + pageSize + ",'" + funcParam + "');\">"
						+ (i + 1 - first) + "</a></li>\n");
			}
		}

		if (last - end > slider) {
			sb.append("<li class=\"disabled\"><a href=\"javascript:\">...</a></li>\n");
			end = last - slider;
		}

		for (int i = end + 1; i <= last; i++) {
			sb.append("<li><a href=\"javascript:\" onclick=\"" + funcName + "(" + i + "," + pageSize + ",'" + funcParam + "');\">" + (i + 1 - first)
					+ "</a></li>\n");
		}

		if (pageNo == last) {
			sb.append("<li class=\"disabled\"><a href=\"javascript:\">下一页 &#187;</a></li>\n");
		} else {
			sb.append("<li><a href=\"javascript:\" onclick=\"" + funcName + "(" + next + "," + pageSize + ",'" + funcParam + "');\">"
					+ "下一页 &#187;</a></li>\n");
		}

		sb.append("<li class=\"disabled controls\"><a href=\"javascript:\">当前 ");
		sb.append("<input type=\"text\" value=\"" + pageNo + "\" onkeypress=\"var e=window.event||this;var c=e.keyCode||e.which;if(c==13)");
		sb.append(funcName + "(this.value," + pageSize + ",'" + funcParam + "');\" onclick=\"this.select();\"/> / ");
		sb.append("<input type=\"text\" value=\"" + pageSize + "\" onkeypress=\"var e=window.event||this;var c=e.keyCode||e.which;if(c==13)");
		sb.append(funcName + "(" + pageNo + ",this.value,'" + funcParam + "');\" onclick=\"this.select();\"/> 条，");
		sb.append("共 " + count + " 条" + (message != null ? message : "") + "</a></li>\n");

		sb.insert(0, "<ul>\n").append("</ul>\n");

		sb.append("<div style=\"clear:both;\"></div>");

		// sb.insert(0,"<div class=\"page\">\n").append("</div>\n");

		return sb.toString();
	}
}
